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In addition to its role as an amino acid in protein biosynthesis and as a precursor for the synthesis of NAD + , tryptophan also serves as a precursor for the synthesis of the neurotransmitters serotonin and melatonin

continuously fed a diet containing NAC + Gly to aged male mice for eight weeks, which corrected GSH levels and promoted the expression of GSH synthesis enzymes (GCLC, GCLM and GS) in the heart, liver and kidney, prolonging the lifespan of aged mice [50]

Traditionally, AD is tackled with drugs like acetylcholinesterase inhibitors (e.g., donepezil, galantamine, rivastigmine) (35) and the N-Methyl-D-Aspartate (NMDA) receptor allosteric modulator, memantine (68)

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